<template>
  <ul>
    <li :style="{opacity}">欢迎学习Vue</li>
    <li>news001 <input type="text"></li>
    <li>news002 <input type="text"></li>
    <li>news003 <input type="text"></li>
  </ul>
</template>

<script>
export default {
  name: "News",
  data() {
    return {
      opacity:1
    }
  },
  // 使用两个新的生命周期钩子实现功能
  activated() {  // 组件激活时调用
    console.log('News组件被激活了');
    this.timer = setInterval(() => {
      console.log('@');
      this.opacity -= 0.01
      if(this.opacity <= 0) this.opacity = 1
    }, 16);
  },
  deactivated() { // 组件失活时调用
    console.log('News组件失活了');
    clearInterval(this.timer)
  }
  

  /* beforeDestroy() {
    console.log('News组件即将被销毁了');
    clearInterval(this.timer)
  },
  mounted() {
    this.timer = setInterval(() => {
      console.log("@");
      this.opacity -= 0.01
      if(this.opacity <= 0) this.opacity = 1
    }, 16);
  } */
};
</script>